AstronomyPicture of the Day—Happy Birthday To You

HAPPY BIRTHDAY TO MY GIRL！

2018 December 7

The Earth from Apollo 17

PictureCredit: NASA, Apollo 17, NSSDC

HAPPY BIRTHDAY TO MY GIRL！

Explanation:On December 7, 1972, Astronauts on the United States's last lunar mission,Apollo 17, took this picture looking back at the Earth on their way to themoon. The continents of Antarctica and Africa are visible below the delicatewisps of white clouds.

蓝色弹珠(The Blue Marble)是一张在1972年12月7日由阿波罗17号太空船船员所拍摄的著名地球照片。当时太空船正运行至距离地球45,000公里(28,000英里)之处。这张照片是迄今为止最广泛流传的照片。它是少数能把整个地球清晰地拍下来的照片，正因拍摄当时太空船正背向太阳。此时，对于身在太空船上的太空人来说，地球的大小就像小孩子的玩耍的弹珠一样，因而命名。